Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a43933e41c924d…

MALICIOUS

PDF

57.6 KB Created: 2020-08-21 10:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b8a6b9335adb720a8b8d90a6439ad06 SHA-1: 4d6596ac6af028487b717acc473c7fe707377afa SHA-256: 84a43933e41c924d7ca872fdc4de9a3acb3a9bcd2dfe502237c83e2780b51171
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The document also exhibits a 'Browser extension / update installation lure' heuristic, indicating a social engineering attempt to trick the user into clicking the malicious link. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external PDF links suggests a link farm used for SEO poisoning or distributing further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=unblock+youku+android+2018
    • http://jupeverad.akaoxo.org/uploads/1/3/1/4/131453463/ab022b39c6.pdf
    • http://kenazonez.zakuromedia.com/uploads/1/3/1/4/131408061/rolirodobijuxotogox.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/7152/7325/files/55953572239.pdf
    • https://cdn.shopify.com/s/files/1/0430/1701/1353/files/78330269924.pdf
    • https://cdn.shopify.com/s/files/1/0435/1416/7450/files/57403903659.pdf
    • https://cdn.shopify.com/s/files/1/0439/9346/4990/files/panera_bread_job_application.pdf
    • https://cdn.shopify.com/s/files/1/0431/2072/2080/files/dulavitodudodak.pdf
    • https://cdn.shopify.com/s/files/1/0434/1393/0142/files/university_of_michigan_north_campus_map.pdf
    • https://cdn.shopify.com/s/files/1/0432/7204/4697/files/pre_islamic_arabia_political_condition.pdf
    • https://cdn.shopify.com/s/files/1/0437/9593/9488/files/63784500994.pdf
    • https://cdn.shopify.com/s/files/1/0440/4002/8325/files/assamese_new_dj.pdf
    • https://cdn.shopify.com/s/files/1/0429/7503/5541/files/python_restart_script.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006672.bin
1f8e094fa408cec8134c5e4e7fa1bd74a268748a65ab724c9d02472011e25e5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6672 10452 bytes
font_01_sfnt_off00008932.bin
31db5f249946e6c9d6a8e518a2f8380f0cb9e0ee1910976b0a300f416e5d1473		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8932 5572 bytes
font_02_sfnt_off00009c35.bin
b137ada9e0dd46808c06e531e00417b455ee3236fc58e60129367cbb5d55acd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C35 10692 bytes
font_03_sfnt_off0000c0ec.bin
b0a16d4e3bda472e73041ea1d2924c1c16c55db4d54687382c089476984b0b79		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0EC 16992 bytes

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